/// <summary>
/// Decrypts the ciphertext.
/// </summary>
internal static byte[] DecryptWithKey(byte[] cipherText, SqlCipherMetadata md, string serverName)
{
Debug.Assert(serverName != null, @"serverName should not be null in DecryptWithKey.");
// Initialize cipherAlgo if not already done.
if (!md.IsAlgorithmInitialized())
{
SqlSecurityUtility.DecryptSymmetricKey(md, serverName);
}
Debug.Assert(md.IsAlgorithmInitialized(), "Decryption Algorithm is not initialized");
try {
byte[] plainText = md.CipherAlgorithm.DecryptData(cipherText); // this call succeeds or throws.
if (null == plainText)
{
throw SQL.NullPlainText();
}
return(plainText);
}
catch (Exception e) {
// compute the strings to pass
string keyStr = GetBytesAsString(md.EncryptionKeyInfo.Value.encryptedKey, fLast: true, countOfBytes: 10);
string valStr = GetBytesAsString(cipherText, fLast: false, countOfBytes: 10);
throw SQL.ThrowDecryptionFailed(keyStr, valStr, e);
}
}
/// <summary>
/// Encrypts the plaintext.
/// </summary>
internal static byte[] EncryptWithKey (byte[] plainText, SqlCipherMetadata md, string serverName) {
Debug.Assert(serverName != null, @"serverName should not be null in EncryptWithKey.");
// Initialize cipherAlgo if not already done.
if (!md.IsAlgorithmInitialized()) {
SqlSecurityUtility.DecryptSymmetricKey(md, serverName);
}
Debug.Assert(md.IsAlgorithmInitialized(), "Encryption Algorithm is not initialized");
byte[] cipherText = md.CipherAlgorithm.EncryptData(plainText); // this call succeeds or throws.
if (null == cipherText || 0 == cipherText.Length) {
SQL.NullCipherText();
}
return cipherText;
}
/// <summary>
/// Is the algorithm handle for the cipher encryption initialized ?
/// </summary>
/// <returns></returns>
internal bool IsAlgorithmInitialized()
{
if (null != cipherMD)
{
return(cipherMD.IsAlgorithmInitialized());
}
return(false);
}
/// <summary>
/// Decrypts the ciphertext.
/// </summary>
internal static byte[] DecryptWithKey(byte[] cipherText, SqlCipherMetadata md, string serverName) {
Debug.Assert(serverName != null, @"serverName should not be null in DecryptWithKey.");
// Initialize cipherAlgo if not already done.
if (!md.IsAlgorithmInitialized()) {
SqlSecurityUtility.DecryptSymmetricKey(md, serverName);
}
Debug.Assert(md.IsAlgorithmInitialized(), "Decryption Algorithm is not initialized");
try {
byte[] plainText = md.CipherAlgorithm.DecryptData(cipherText); // this call succeeds or throws.
if (null == plainText) {
throw SQL.NullPlainText ();
}
return plainText;
}
catch (Exception e) {
// compute the strings to pass
string keyStr = GetBytesAsString(md.EncryptionKeyInfo.Value.encryptedKey, fLast:true, countOfBytes:10);
string valStr = GetBytesAsString(cipherText, fLast:false, countOfBytes:10);
throw SQL.ThrowDecryptionFailed(keyStr, valStr, e);
}
}